<template>
    <div>
        <div class="shopcart">
            <div class="content" @click="toggleList">
                <div class="content-left">
                    <div class="logo-wrapper">
                        <div class="logo" :class="{'highlight':totalCount>0}">
                            <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
                        </div>
                        <div class="num" v-show="totalCount>0">{{ totalCount }}</div>
                    </div>
                    <div class="price" :class="{'highlight':totalPrice>0}">¥{{ totalPrice }}</div>
                    <div class="desc">另需配送费¥{{ deliveryPrice }}</div>
                </div>
                <div class="content-right" @click.stop.prevent="pay">
                    <div class="pay" :class="payClass">
                        {{ payDesc }}
                    </div>
                </div>
            </div>
            <div class="ball-container">
                <div v-for="ball in balls"  :key="ball.key">
                    <transition name="drop" @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
                        <div class="ball" v-show="ball.show">
                            <div class="inner inner-hook"></div>
                        </div>
                    </transition>
                </div>
            </div>
            <transition name="fold">
                <div class="shopcart-list" v-show="listShow">
                    <div class="list-header">
                        <h1 class="title">购物车</h1>
                        <span class="empty" @click="empty">清空</span>
                    </div>
                    <div class="list-content" ref="listContent">
                        <ul>
                            <li class="food" v-for="food in selectFoods" :key="food.key">
                                <span class="name">{{ food.name }}</span>
                                <div class="price">
                                    <span>¥{{ food.price*food.count }}</span>
                                </div>
                                <div class="cartcontrol-wrapper">
                                    <cartcontrol :food="food" @increment="drop"></cartcontrol>
                                </div>
                            </li>
                        </ul>
                    </div>
                </div>
            </transition>
        </div>
        <transition name="fade">
            <div class="list-mask" v-show="listShow" @click="hideList"></div>
        </transition>
    </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import cartcontrol from 'components/cartcontrol/cartcontrol';

  export default {
    data() {
      return {
          balls: [
              {
                  show: false
              },
              {
                  show: false
              },
              {
                  show: false
              },
              {
                  show: false
              },
              {
                  show: false
              }
          ],
          dropBalls: [],
          fold: false
      };
    },
    components: {
        cartcontrol
    },
    props: {
        deliveryPrice: {
            type: Number,
            default: 0
        },
        minPrice: {
            type: Number,
            default: 0
        },
        selectFoods: {
            type: Array,
            default() {
                return [];
            }
        }
    },
    computed: {
        totalPrice() {
            let total = 0;
            this.selectFoods.forEach((food) => {
                total += food.price * food.count;
            });
            return total;
        },
        totalCount() {
            let count = 0;
            this.selectFoods.forEach((food) => {
               count += food.count;
            });
            return count;
        },
        payDesc() {
            if (this.totalPrice === 0) {
                return `¥${this.minPrice}元起送`;
            } else if (this.totalPrice < this.minPrice) {
                let diff = this.minPrice - this.totalPrice;
                return `还差¥${diff}元起送`;
            } else {
                return '去结算';
            }
        },
        payClass() {
            if (this.totalPrice < this.minPrice) {
                return 'not-enough';
            } else {
                return 'enough';
            }
        },
        listShow() {
            if (!this.totalCount) {
                // eslint-disable-next-line
                this.fold = true;
                return false;
            }
            let show = !this.fold;
            if (show) {
                this.$nextTick(() => {
                    if (!this.scroll) {
                        // eslint-disable-next-line
                        this.scroll = new BScroll(this.$refs.listContent, {
                            click: true,
                            probeType: 3
                        });
                    } else {
                        this.scroll.refresh();
                    }
                });
            }
            return show;
        }
    },
    methods: {
        drop(el) {
            this.$nextTick(() => {
                for (let i = 0; i < this.balls.length; i++) {
                    let ball = this.balls[i];
                    if (!ball.show) {
                        ball.show = true;
                        ball.el = el;
                        this.dropBalls.push(ball);
                        return;
                    }
                }
            });
        },
        toggleList() {
            if (!this.totalCount) {
                return;
            }
            this.fold = !this.fold;
        },
        beforeEnter(el) {
            let count = this.balls.length;
            while (count--) {
                let ball = this.balls[count];
                if (ball.show) {
                    let rect = ball.el.getBoundingClientRect();
                    let x = rect.left - 32;
                    let y = -(window.innerHeight - rect.top - 22);
                    el.style.display = '';
                    el.style.webkitTransform = `translate3d(0,${y}px,0)`;
                    el.style.transform = `translate3d(0,${y}px,0)`;
                    let inner = el.getElementsByClassName('inner-hook')[0];
                    inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
                    inner.style.transform = `translate3d(${x}px,0,0)`;
                }
            }
        },
        enter(el) {
            /* eslint-disable no-unused-vars */
            let rf = el.offsetHeight;
            this.$nextTick(() => {
                el.style.webkitTransform = 'translate3d(0,0,0)';
                el.style.transform = 'translate3d(0,0,0)';
                let inner = el.getElementsByClassName('inner-hook')[0];
                inner.style.webkitTransform = 'translate3d(0,0,0)';
                inner.style.transform = 'translate3d(0,0,0)';
            });
        },
        afterEnter(el) {
            let ball = this.dropBalls.shift();
            if (ball) {
                ball.show = false;
                el.style.display = 'none';
            }
        },
        empty() {
            this.selectFoods.forEach((food) => {
                food.count = 0;
            });
        },
        hideList() {
            this.fold = true;
        },
        pay() {
            if (this.totalPrice < this.minPrice) return;
            window.alert(`支付${this.totalPrice}元`);
        }
    }
  };
</script>

<style lang="stylus">
    @import '../../common/styles/mixin.styl';

    .shopcart
        position fixed
        bottom 0
        left 0
        z-index 50
        width 100%
        height 48px
        .content
            display flex
            background #141d27
            font-size 0
            color rgba(255,255,255,.4)
            .content-left
                flex 1
                .logo-wrapper
                    display inline-block
                    vertical-align top
                    position relative
                    top -10px
                    margin 0 12px
                    padding 6px
                    width 56px
                    height 56px
                    box-sizing border-box
                    border-radius 50%
                    background #141d27
                    .logo
                        width 100%
                        height 100%
                        border-radius 50%
                        background #2b343c
                        text-align center
                        &.highlight
                            background rgb(0,160,220)
                        .icon-shopping_cart
                            line-height 44px
                            font-size 24px
                            color #80858a
                            &.highlight
                                color #fff
                    .num
                        position absolute
                        top 0
                        right 0
                        width 24px
                        height 16px
                        line-height 18px
                        text-align center
                        border-radius 16px
                        font-size 9px
                        font-weight 700
                        color #ffffff
                        background rgb(240,20,20)
                        box-shadow 0 4px 8px 0 rgba(0,0,0,.4)
                .price
                    display inline-block
                    vertical-align top
                    line-height 24px
                    margin-top 12px
                    padding-right 12px
                    box-sizing border-box
                    border-right 1px solid rgba(255,255,255,.1)
                    font-size 16px
                    font-weight 700
                    &.highlight
                        color #fff
                .desc
                    display inline-block
                    vertical-align top
                    margin 12px 0 0 12px
                    line-height 28px
                    font-size 10px
            .content-right
                flex 0 0 105px
                width 105px
                .pay
                    height 48px
                    line-height 48px
                    text-align center
                    font-size 12px
                    font-weight 700
                    background #2b333b
                    &.not-enough
                        background #2b333b
                    &.enough
                        background #00b43c
                        color #fff
        .ball-container
            .ball
                position fixed
                left 32px
                bottom 22px
                z-index 200
                transition all 0.4s cubic-bezier(0.49,-0.29,0.75,0.41)
                .inner
                    width 16px
                    height 16px
                    border-radius 50%
                    background rgb(0,160,220)
                    transition all 0.4s linear
        .shopcart-list
            position absolute
            top 0
            left 0
            z-index -1
            width 100%
            transform translate3d(0,-100%,0)
            &.fold-enter-active, &.fold-leave-active
                transition all 0.5s
            &.fold-enter, &.fold-leave-to
                transform translate3d(0,0,0)
            .list-header
                height 40px
                line-height 40px
                padding 0 18px
                background #f3f5f7
                border-bottom 1px solid rgba(7,17,27,.1)
                .title
                    float left
                    font-size 14px
                    color rgb(7,17,27)
                .empty
                    float right
                    font-size 12px
                    color rgb(0,160,220)
            .list-content
                padding 0 18px
                max-height 217px
                background #ffffff
                overflow hidden
                .food
                    position relative
                    padding 12px 0
                    box-sizing border-box
                    border-1px(rgba(7,17,27,.1))
                    .name
                        line-height 24px
                        font-size 14px
                        color rgb(7,17,27)
                    .price
                        position absolute
                        right 90px
                        bottom 12px
                        line-height 24px
                        font-size 14px
                        font-weight 700
                        color rgb(240,20,20)
                    .cartcontrol-wrapper
                        position absolute
                        right 0
                        bottom 6px
    .list-mask
        position fixed
        top 0
        left 0
        width 100%
        height 100%
        z-index 40
        background rgba(7,17,27,.6)
        backdrop-filter blur(10px)
        &.fade-enter-active, &.fade-leave-active
            transition all 0.5s
        &.fade-enter, &.fade-leave-to
            opacity 0
            background rgba(7,17,27,0)
</style>
